Knapsack belt



FIG. 1 is a front elevational view of a knapsack belt showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof.

The broken line showing of a buckle in FIGS 1 through 5 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a knapsack belt, as shown and described. 